THE POPULATION OF LONG-PERIOD TRANSITING EXOPLANETS
THE POPULATION OF LONG-PERIOD TRANSITING EXOPLANETS
复制标题
长周期凌日系外行星的数量
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
B. Scholkopf
中科院分区：
文献类型：
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作者：
D. Foreman;T. Morton;D. Hogg;E. Agol;B. Scholkopf
开普勒使命已经发现了数千颗系外行星，并彻底改变了我们对它们人口的理解。这一庞大的、同质的发现目录使人们能够严格研究系外行星和行星系统的发生率与其物理性质的关系。然而，像开普勒这样的凌日调查对轨道周期比木星和土星的轨道周期短得多的行星最敏感，木星和土星是我们太阳系中最大的行星。为了解决这一缺陷，我们对长周期系外行星进行了全自动搜索，这些系外行星在开普勒光变曲线档案中只有一到两次凌日。当应用于1040，000颗最明亮的类太阳目标恒星时，这项搜索产生了16颗长周期系外行星候选者。在这些候选者中，有六个是新发现，五个是在具有内部短周期凌日行星的系统中。由于我们的方法不涉及人为干预，我们凭经验描述了我们搜索的检测效率。基于这些结果，我们测量出轨道周期在2-25年范围内的比木星小的系外行星的平均出现率为每颗类日星星2.0 ± 0.7颗行星。
The Kepler mission has discovered thousands of exoplanets and revolutionized our understanding of their population. This large, homogeneous catalog of discoveries has enabled rigorous studies of the occurrence rate of exoplanets and planetary systems as a function of their physical properties. However, transit surveys such as Kepler are most sensitive to planets with orbital periods much shorter than the orbital periods of Jupiter and Saturn, the most massive planets in our solar system. To address this deficiency, we perform a fully automated search for long-period exoplanets with only one or two transits in the archival Kepler light curves. When applied to the ∼40,000 brightest Sun-like target stars, this search produces 16 long-period exoplanet candidates. Of these candidates, six are novel discoveries and five are in systems with inner short-period transiting planets. Since our method involves no human intervention, we empirically characterize the detection efficiency of our search. Based on these results, we measure the average occurrence rate of exoplanets smaller than Jupiter with orbital periods in the range 2–25 years to be 2.0 ± 0.7 planets per Sun-like star.